//
//
// Copyright 2023 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//

#include "src/core/lib/channel/call_tracer.h"

#include <vector>

#include "gtest/gtest.h"

#include <grpc/event_engine/memory_allocator.h>
#include <grpc/grpc.h>

#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/promise/context.h"
#include "src/core/lib/resource_quota/memory_quota.h"
#include "src/core/lib/resource_quota/resource_quota.h"
#include "test/core/test_util/fake_stats_plugin.h"
#include "test/core/test_util/test_config.h"

namespace grpc_core {
namespace {

class CallTracerTest : public ::testing::Test {
 protected:
  void SetUp() override {
    memory_allocator_ = new MemoryAllocator(
        ResourceQuota::Default()->memory_quota()->CreateMemoryAllocator(
            "test"));
    arena_ = Arena::Create(1024, memory_allocator_);
  }

  void TearDown() override {
    arena_->Destroy();
    delete memory_allocator_;
  }

  MemoryAllocator* memory_allocator_ = nullptr;
  Arena* arena_ = nullptr;
  grpc_call_context_element context_[GRPC_CONTEXT_COUNT] = {};
  std::vector<std::string> annotation_logger_;
};

TEST_F(CallTracerTest, BasicClientCallTracer) {
  FakeClientCallTracer client_call_tracer(&annotation_logger_);
  AddClientCallTracerToContext(context_, &client_call_tracer);
  static_cast<CallTracerAnnotationInterface*>(
      context_[GRPC_CONTEXT_CALL_TRACER_ANNOTATION_INTERFACE].value)
      ->RecordAnnotation("Test");
  EXPECT_EQ(annotation_logger_, std::vector<std::string>{"Test"});
}

TEST_F(CallTracerTest, MultipleClientCallTracers) {
  promise_detail::Context<Arena> arena_ctx(arena_);
  FakeClientCallTracer client_call_tracer1(&annotation_logger_);
  FakeClientCallTracer client_call_tracer2(&annotation_logger_);
  FakeClientCallTracer client_call_tracer3(&annotation_logger_);
  AddClientCallTracerToContext(context_, &client_call_tracer1);
  AddClientCallTracerToContext(context_, &client_call_tracer2);
  AddClientCallTracerToContext(context_, &client_call_tracer3);
  static_cast<CallTracerAnnotationInterface*>(
      context_[GRPC_CONTEXT_CALL_TRACER_ANNOTATION_INTERFACE].value)
      ->RecordAnnotation("Test");
  EXPECT_EQ(annotation_logger_,
            std::vector<std::string>({"Test", "Test", "Test"}));
}

TEST_F(CallTracerTest, MultipleClientCallAttemptTracers) {
  promise_detail::Context<Arena> arena_ctx(arena_);
  FakeClientCallTracer client_call_tracer1(&annotation_logger_);
  FakeClientCallTracer client_call_tracer2(&annotation_logger_);
  FakeClientCallTracer client_call_tracer3(&annotation_logger_);
  AddClientCallTracerToContext(context_, &client_call_tracer1);
  AddClientCallTracerToContext(context_, &client_call_tracer2);
  AddClientCallTracerToContext(context_, &client_call_tracer3);
  auto* attempt_tracer =
      static_cast<ClientCallTracer*>(
          context_[GRPC_CONTEXT_CALL_TRACER_ANNOTATION_INTERFACE].value)
          ->StartNewAttempt(true /* is_transparent_retry */);
  attempt_tracer->RecordAnnotation("Test");
  EXPECT_EQ(annotation_logger_,
            std::vector<std::string>({"Test", "Test", "Test"}));
  attempt_tracer->RecordEnd(gpr_timespec());
}

TEST_F(CallTracerTest, BasicServerCallTracerTest) {
  FakeServerCallTracer server_call_tracer(&annotation_logger_);
  AddServerCallTracerToContext(context_, &server_call_tracer);
  static_cast<CallTracerAnnotationInterface*>(
      context_[GRPC_CONTEXT_CALL_TRACER].value)
      ->RecordAnnotation("Test");
  static_cast<CallTracerAnnotationInterface*>(
      context_[GRPC_CONTEXT_CALL_TRACER_ANNOTATION_INTERFACE].value)
      ->RecordAnnotation("Test");
  EXPECT_EQ(annotation_logger_, std::vector<std::string>({"Test", "Test"}));
}

TEST_F(CallTracerTest, MultipleServerCallTracers) {
  promise_detail::Context<Arena> arena_ctx(arena_);
  FakeServerCallTracer server_call_tracer1(&annotation_logger_);
  FakeServerCallTracer server_call_tracer2(&annotation_logger_);
  FakeServerCallTracer server_call_tracer3(&annotation_logger_);
  AddServerCallTracerToContext(context_, &server_call_tracer1);
  AddServerCallTracerToContext(context_, &server_call_tracer2);
  AddServerCallTracerToContext(context_, &server_call_tracer3);
  static_cast<CallTracerAnnotationInterface*>(
      context_[GRPC_CONTEXT_CALL_TRACER_ANNOTATION_INTERFACE].value)
      ->RecordAnnotation("Test");
  EXPECT_EQ(annotation_logger_,
            std::vector<std::string>({"Test", "Test", "Test"}));
}

}  // namespace
}  // namespace grpc_core

int main(int argc, char** argv) {
  ::testing::InitGoogleTest(&argc, argv);
  grpc::testing::TestEnvironment env(&argc, argv);
  grpc_init();
  auto r = RUN_ALL_TESTS();
  grpc_shutdown();
  return r;
}
